Add or subtract as indicated. Write the answer in simplest form. - 

A.
B. - 
C. - 
D.

Answer: D

Mathematics

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Find the standard equation of a parabola with the given focus or directrix. Assume that the vertex is at the origin.Directrix y = - 

A. x2 = 12y B. y2 = 12x C. x2 = 3y D. y2 = 3x

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Mathematics

Find the exact value of the expression.

A.
B.
C.
D. 2

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Mathematics

Multiply and simplify. ? 

A.
B.
C. - 
D. - 

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Mathematics

Find the exact value of the expression in degrees without using a calculator or table.sin-1 

A. 60° B. 135° C. 120° D. 45°

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Mathematics